Art of filling teeth.



PATENTED MAY 10, 1904. B. BOSCH. ART OF FILLING TEETH. APPLICATION FILEDJAN. 26. 1903.

. llllllmi N0 MODEL.

UNITED STATES Patented May 10, 1904.

PATENT ()EEIGE.

EDUARD BOSCH, OF GENEVA, SWITZERLAND, ASSIGNOR TO P. A. KOLLIKER & 00.,OF ZURICH, SlVITZERLAND, A FIRM.

ART OF FILLING TEETH.

SPECIFICATION forming part of Letters Patent No. 759,498, dated May 10,1904.

Application filed January 26, 1903. Serial No, 140,569. (No model.)

To all 10/1/0121, it may concern:

Be it known that I, EDUARD Boson, a citizen of the Republic ofSwitzerland, residing at Geneva, Switzerland, have invented a new anduseful Improvement in the Art of Filling Teeth, of which the followingis a specification.

In the art of filling teeth to which this invention pertains it is verydifiicult to secure the filler in the cavity of the tooth by means ofcement in a durable manner, and this is especially true when fillings ofa vitrifiable substance, as a glass or porcelain composition, are used,as the cement will not as firmly adhere to a vitrified or glazed surfaceas it will to the walls ofa cavity in a tooth.

This invention has for its object a process whereby a better and moredurable connection between tooth and filling is obtained; and itconsists, broadly, in securing to the filling before vitrification orfiring an anchor, so that the filling may be anchored in the cementusually employed to cement fillings into the cavities of teeth.

That my invention may be fully understood I will proceed to describe thesame in detail, reference being had to the accompanying drawings, inwhich-- Figure 1 shows in elevation a preferred form of anchor. Fig. 2is a sectional view of one of the preliminary steps in the preparationor making of the filling. Fig. 3 shows in elevation and plan a cylinderused in the process. Fig. 4 is a sectional view illustrating the mannerof perforating the cylinder shown in Fig. 3. Fig. 5 is a sectional Viewillustrating the step in the preparation of the filler before vitrifyingor firing, and Fig. 6 is a like view showing the filler cemented in thecavity of a tooth and anchored in the cement.

In carrying out my invention I first obtain a mold from the cavity ofthe tooth by means of foil, either gold or platinum foil, which mold (Zis embedded in a composition of matter 0 adapted to set and harden orbecome hard under the action of heat. After the mold has been embeddedin the material a I place an anchor A, preferably of platinum, inposition in the mold, said anchor consisting of a pin having apreferably discoidal head I), a shank a, preferably cylindrical and ofuniform cross-section from the head 7) to a collar cof greater diameterthan said head, and of a pointed portion a, projecting centrally fromthe collar 0, Figs. 1, 2, and 5. The pointed end of the pin is nowinserted through the center of the mold (Z into the material 0 until thecollar 0 seats on the bottom of the moldcavity, said material a servingas a holder, and may consist of a mixture of onethird pure molding-sandand two-thirds plaster-of-paris mixed with water. I next. perforate acylinder f" of a more or less yielding or compressible refractorymaterial-as, for instance, gold or platinum sponge-by means of a taperedtool 1 as shown in dotted lines in Fig. 4, to form a tapering hole ofsufiicient diameter at its upper narrower end to adapt the cylinder tobe slipped over the head I) of the anchor A and of approximatelysuflicient diameter at its lower wider end to encompass the collar 0 ofsaid anchor, after which the disk f is lightly pressed around the collar0 and the shank a, as shown in Fig. 5. The length of the anchor Abetween the head 6 and collar 0 will depend upon the depth of the cavityto be filled, so that instead of one cylinder f two or more may berequired, care being taken to leave the necessary space above thecylinder or cylindersf for the filling composition g, which may be aglass or porcelain composition or enamel, applied so as to fill themold-cavity and inclose the cylinder or cylinders f, the shank a abovesaid cylinder or cylinders, and the head 6 of the anchor, as shown inFig. 5. The filling is now vitrified or fired, as the case may be, inthe usual or any preferred manner, after which the mold (Z, with itssupport a, are removed, and the pointed end a of the anchor A is cut orsawed o'll'as close to the collar 0 as possible, and the cylinder orcylinders fare then removed or dug out from above said collar, thusleaving a cavity in the filling 9 around the shank a of the anchor, thecollar 0 constituting the anchoring device for anchoring the filling inthe cement h by means of which the said filling is cemented into thecavity of a tooth.

From an inspection of Fig. 5 it will be seen that the fillingcomposition around the disk or disks f is merely a very thin shell, andwhen an increased cementing-surface is desired this shell or rim g iscut away, as shown in Fig. 6, which shows the filling g cemented intothe cavity of the tooth and anchored in the cemerit h.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is

1. The method of filling teeth, which consists in taking an impressionof the cavity to be filled, making a mold from the impression so taken,molding the filling, fixing an anchor in the filling and anchoring thefilling in the cavity of the tooth, substantially as described.

2. The method of filling teeth, which consists in forming asuitably-shaped cavity, taking an impression of the cavity, making amold from the impression, making the filling around an anchor in saidmold, and anchoring the filling in the cavity, substantially asdescribed.

3. The method of filling teeth, which consists in taking an impressionin metal foil of the cavity to be filled, backing up the impression toform a mold, fixing an anchor in the mold and forming on the anchor thefilling, removing the filling and anchor from the foil mold and thencementing the anchor and filling in the tooth, substantially asdescribed.

4:. The method of filling teeth, which consists in formingasuitably-shaped cavity, taking an impression thereof in metal foil,backing up the foil to form a mold, passing an anchor-pin through thefoil into the backing, said anchor partly surrounded by a non-fusibleremovable packing, fusing the filling around the anchor and packing,removing the filling with the anchor attached from the mold, separatingthe non-fusible substance and cementing the filling in place in thetooth, substantially as described.

5. The method of filling teeth, which consists in forming asuitably-shaped cavity, taking an impression thereof in metal foil,backing up the foil to form a mold, passing an anchor-pin having a headand shank and a pointed portion projecting from a collar on the shankthrough the foil into the backing, said anchor partly surrounded by anon-fusible removable packing, fusing the filling around the anchor andpacking, removing the filling with the anchor attached from the mold,removing the pointed portion of the anchor close to the collar,separating the non-fusible substance and cementing the filling in placein the tooth, substantially as described.

In testimony that I claim the foregoing as my invention 1 have signed myname in presence of two subscribing witnesses.

EDUARD BOSCH.

Witnesses:

LOUIS POUZETT, ADRIEN GALLAND.

